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Multiple server install -multi[ple front ends - ?

Is there a way of having multiple web servers (message stores) in a way that when a user logs in to the main one and the mailbox resides on another server it forwards him over to the other server ? -I don't have money for load balancer ?-

also is there a way to have the message store and the tomcat seprate ? -is it even a good idea ?-

Thanks !

so I can have an MTA server, an LDAP server, (maybe Mysql ?), and more than one message stores where all of them are exposed to the internet ? or only one and is exposed and then the other message stores gets their traffic routed trough the main one ?